Pre- and Postoperative Chest Therapy With Positive Expiratory Pressure (PEP) to Prevent Hospital-acquired Pneumonia

The goal of this clinical trial is to investigate whether pre- and postoperative treatment with systematic PEP therapy can prevent hospital-acquired pneumonia in patients with hip frac-ture. It will also learn about the barriers regarding PEP therapy in this group of patients. * Does pre- and postoperative treatment with systematic PEP therapy prevent hospital-acquired pneumonia in patients with hip fracture? * Which barriers do participants have regarding PEP therapy in this group of patients? Researchers will compare systematic PEP therapy to no intervention besides standard treat-ment to see if systematic therapy with PEP can prevent hospital-acquired pneumonia. Participants will: * Receive systematic PEP therapy during hospitalization or no intervention besides standard treatment * Register the PEP therapy four times daily on a paper checklist. Failure to perform the treatment and the reason must also be documented on the checklist.